I also recommend 'The Arryn's Redemption'. This story takes an Arryn character who has made some mistakes and shows their journey towards redemption. It's well - written with great character development and gives a fresh perspective on the Arryn family in the 'Game of Thrones' universe.
There's a fanfiction called 'Arryn's Legacy'. It focuses on how the Arryn family's influence spreads over time in the Seven Kingdoms. It has interesting plot twists where the Arryns interact with other major houses in unexpected ways, making it a really engaging read.
One great 'Game of Thrones' Arryn fanfiction is 'The Arryn's Ascent'. It delves into the life of an Arryn character in a way that feels very true to the complex world of Westeros. The author does an excellent job of portraying the political intrigue and personal struggles that an Arryn might face.
One great 'Game of Thrones House Arryn fanfiction' is 'The Arryn Ascent'. It focuses on the rebuilding of House Arryn's power. The author beautifully describes the Vale's landscapes and the political maneuverings within the house.
A fanfiction story could involve the Arryn family uncovering a plot related to the Blackfyre. The Arryns, known for their political astuteness, could find themselves in a situation where they have to decide whether to support or oppose the Blackfyre cause. This decision would likely be influenced by how it would affect their own power in the Vale and their relationships with other great houses in Westeros. For example, if they support the Blackfyre and it angers the current ruling power, they might face retaliation. But if they oppose it when it might be a winning side, they could miss out on potential rewards.
In fanfiction, Lysa Arryn could be paired with Varys. Varys is known for his web of spies and political maneuvering. A story with them together could involve Varys trying to use Lysa for his own political ends in the Vale or Lysa trying to outwit Varys. Another great pairing could be with Brienne of Tarth. Brienne's sense of honor and Lysa's more self - serving nature could create an interesting dynamic. They could be in a situation where Brienne has to protect Lysa or Lysa has to decide whether to trust Brienne. And of course, Tyrion Lannister could be paired with her. Given Tyrion's intelligence and Lysa's paranoia, a fanfiction exploring their encounters and how they interact could be full of drama and unexpected twists.
In this 'Arryn Another Claimant' Game of Thrones fanfiction, Arryn could potentially be a new character created by the author. Maybe Arryn is someone who believes they have a legitimate claim to the Iron Throne, perhaps related to an old and forgotten branch of a noble house in Westeros. Without reading the fanfiction in detail, it's hard to say exactly who this Arryn is, but it's likely they will play a significant role in the power struggles and political intrigue that are hallmarks of Game of Thrones stories.
One possible story could be about Arryn Blackfyre's rise to power in a fictional scenario within the Game of Thrones world. Maybe he discovers a long - lost Targaryen heirloom that gives him a claim to the Iron Throne and he starts to gather supporters.
Well, a story could be about a Blackfyre sword being found in the Vale, which is ruled by the Arryns. This discovery could stir up all kinds of rumors and superstitions among the people. The Arryn family would then have to decide what to do with this relic. Do they keep it a secret? Do they try to use it to their advantage? It could be a really interesting plot point.
One great 'Game of Thrones Robert Arryn Fanfic' is 'The Rise of Robert Arryn' which shows his growth and development in a more positive light. It gives him some agency and intelligence that he didn't really get in the show.
One interesting fanfiction could be about Lysa Arryn's early life in the Vale before the events of the series. It might explore her relationship with her family and how it shaped her into the character we see in the show. Another could be a what - if scenario, like what if Lysa Arryn had allied with a different house instead of the Lannisters. There are also fanfictions that focus on her relationship with Littlefinger in more depth, showing the manipulations and her emotional turmoil in that relationship.
Perhaps the OC son has a special ability or gift that Jon Arryn was trying to protect him from being exploited for. After Jon Arryn's death, the son has to learn to control this ability while also dealing with the power struggles in King's Landing. He could be a key figure in the fight against the White Walkers, using his unique skills to help the living, all while trying to uphold his father's legacy.
You can start by looking on Archive of Our Own (AO3). It has a large collection of 'Game of Thrones' fanfiction, including many that focus on the Arryn family. The search function there allows you to easily filter for what you're interested in.